CVE-2022-33991: dproxy-nexgen (aka dproxy nexgen) forwards and caches DNS queries with the CD (aka checking disabled) bit set

This week

MEDIUM 5.3REMOTEMITIGATE

CVE-2022-33991 is a medium-severity flaw (CVSS 5.3) affecting dproxy-nexgen. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

dproxy-nexgen (aka dproxy nexgen) forwards and caches DNS queries with the CD (aka checking disabled) bit set to 1. This leads to disabling of DNSSEC protection provided by upstream resolvers.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-290
Published	2022-08-15
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: dproxy-nexgen project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-08-15 13:15 UTCPublished CVE record published
2026-06-17 04:49 UTCUpdated Record last modified

dproxy-nexgen project dproxy-nexgen MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy dproxy-nexgen || rpm -q dproxy-nexgen || dproxy-nexgen --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2022-33991?

dproxy-nexgen: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-33991 being exploited?

CVE-2022-33991 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2022-33991 affect?

CVE-2022-33991 affects dproxy-nexgen. Severity is medium (CVSS 5.3). dproxy-nexgen (aka dproxy nexgen) forwards and caches DNS queries with the CD (aka checking disabled) bit set to 1. This leads to disabling of DNSSEC protection provided by upstream resolvers.

How urgent is CVE-2022-33991?

Priority 44/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-33990 HIGH 7.5 MITIGATE Misinterpretation of special domain name characters in dproxy-nexgen (aka dproxy nexgen) leads to cache poison
CVE-2022-33989 MEDIUM 5.3 MITIGATE dproxy-nexgen (aka dproxy nexgen) uses a static UDP source port (selected randomly only at boot time) in upstr
CVE-2022-33988 HIGH 7.5 MITIGATE dproxy-nexgen (aka dproxy nexgen) re-uses the DNS transaction id (TXID) value from client queries, which allow

References

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